离散元法在高边坡稳定性中的应用研究
发布时间：2019-01-27 08:52
【摘要】：伴随着我国快速发展的建设事业和西部大开发战略的实施,我国高等级公路建设逐渐由东部转向西部,由平原转入山区。山区地形、地质条件复杂,高填深挖不可避免,所以,高边坡的稳定性研究对公路建设、运营具有重大的意义。虽然目前已经有比如极限平衡法、有限元分析法等研究方法来进行边坡的稳定性分析,但是由于极限平衡法没有考虑土体应力应变关系的影响,而且需要提前假定土坡滑裂面的形状和位置,这些假定和简化可能与实际不符;相比较而言有限单元法计算结果要更准确,但无法动态地模拟土坡的整个破坏过程。作为离散单元法之一的颗粒流方法,就可以很好地弥补上述方法所存在的弊端。本文研究离散元法的颗粒流理论在高填方边坡稳定性的分析中的应用,主要开展了以下的研究工作:1、首先通过了室内实验,研究了高填方所用的填料的物理力学性质。借助试验,获得了在边坡稳定性分析中必需的宏观参数,为后文采用颗粒流理论进行高边坡模型建立所需的细观参数提供依据。试验得出的宏观参数,可采用传统的极限平衡分析方法进行稳定性分析,并与离散元方法的分析结果进行相互对比研究。2、通过详细介绍离散元法颗粒流方法应用于土体分析的基本理论,进行双轴试验数值模拟,建立了细观参数与宏观参数之间的关系,室内试验获取宏观参数匹配颗粒流方法所需的细观参数,为建立高填方土质边坡坡颗粒流模型提供细观参数依据。3、运用离散元颗粒流软件建立了高填方土质边坡颗粒流模型,结合强度折减法和改进的重力增加法对其稳定性动态的模拟了边坡滑动破坏的整个过程,求得其安全系数和土坡滑动破坏面,并将计算结果与基于传统的极限平衡法分析软件的计算结果进行了比较。总之,通过以上的研究分析可知离散元法分析高边坡稳定性可以很好的弥补其他分析方法的不足之处,不需提前假定土坡滑裂面的位置和形状,就能模拟整个土坡的动态破坏过程,并且求得的安全系数和滑动面位置与其他方法的结果非常接近。
[Abstract]:With the rapid development of China's construction and the implementation of the strategy of the development of the western region, the construction of high-grade highways in China has gradually shifted from the east to the west, and from the plain to the mountainous areas. The terrain and geological conditions of mountainous area are complicated and the high fill and deep excavation is inevitable. Therefore, the study of the stability of high slope is of great significance to the construction and operation of highway. Although there are some research methods, such as limit equilibrium method and finite element analysis method, to analyze slope stability, however, the limit equilibrium method does not take into account the influence of stress and strain relationship of soil. Furthermore, the shape and position of the slip surface of the slope need to be assumed in advance, and these assumptions and simplification may not be in accordance with the actual situation. Compared with the finite element method, the finite element method is more accurate, but it can not dynamically simulate the whole failure process of soil slope. As one of the discrete element methods, the particle flow method can make up for the shortcomings of the above methods. In this paper, the application of particle flow theory of discrete element method to the stability analysis of high fill slope is studied. The main research work is as follows: 1. The physical and mechanical properties of fillers used in high fill are studied through laboratory experiments. With the help of experiments, the necessary macro parameters in slope stability analysis are obtained, which provides the basis for the establishment of high slope model by particle flow theory. The macroscopic parameters obtained from the test can be analyzed by the traditional limit equilibrium analysis method, and compared with the results of the discrete element method. By introducing the basic theory of discrete element particle flow method applied to soil analysis, the biaxial test numerical simulation is carried out, and the relationship between meso-parameters and macroscopic parameters is established. The microscopic parameters needed by the macroscopic parameter matching particle flow method are obtained in laboratory test, which provides the meso-parameter basis for the establishment of the grain-flow model on the slope of the high fill soil. 3. The particle flow model of high fill soil slope is established by using discrete element particle flow software. The whole process of slope sliding failure is simulated by combining the strength reduction method and the improved gravity increase method. The safety factor and sliding failure surface of soil slope are obtained, and the calculated results are compared with those based on the traditional limit equilibrium analysis software. In a word, through the above research and analysis, it can be seen that the discrete element method can make up for the shortcomings of other analysis methods, without presupposing the position and shape of the slope sliding surface. The dynamic failure process of the whole slope can be simulated, and the safety factor and sliding surface position obtained are very close to those obtained by other methods.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.14
本文编号：2416109
[Abstract]:With the rapid development of China's construction and the implementation of the strategy of the development of the western region, the construction of high-grade highways in China has gradually shifted from the east to the west, and from the plain to the mountainous areas. The terrain and geological conditions of mountainous area are complicated and the high fill and deep excavation is inevitable. Therefore, the study of the stability of high slope is of great significance to the construction and operation of highway. Although there are some research methods, such as limit equilibrium method and finite element analysis method, to analyze slope stability, however, the limit equilibrium method does not take into account the influence of stress and strain relationship of soil. Furthermore, the shape and position of the slip surface of the slope need to be assumed in advance, and these assumptions and simplification may not be in accordance with the actual situation. Compared with the finite element method, the finite element method is more accurate, but it can not dynamically simulate the whole failure process of soil slope. As one of the discrete element methods, the particle flow method can make up for the shortcomings of the above methods. In this paper, the application of particle flow theory of discrete element method to the stability analysis of high fill slope is studied. The main research work is as follows: 1. The physical and mechanical properties of fillers used in high fill are studied through laboratory experiments. With the help of experiments, the necessary macro parameters in slope stability analysis are obtained, which provides the basis for the establishment of high slope model by particle flow theory. The macroscopic parameters obtained from the test can be analyzed by the traditional limit equilibrium analysis method, and compared with the results of the discrete element method. By introducing the basic theory of discrete element particle flow method applied to soil analysis, the biaxial test numerical simulation is carried out, and the relationship between meso-parameters and macroscopic parameters is established. The microscopic parameters needed by the macroscopic parameter matching particle flow method are obtained in laboratory test, which provides the meso-parameter basis for the establishment of the grain-flow model on the slope of the high fill soil. 3. The particle flow model of high fill soil slope is established by using discrete element particle flow software. The whole process of slope sliding failure is simulated by combining the strength reduction method and the improved gravity increase method. The safety factor and sliding failure surface of soil slope are obtained, and the calculated results are compared with those based on the traditional limit equilibrium analysis software. In a word, through the above research and analysis, it can be seen that the discrete element method can make up for the shortcomings of other analysis methods, without presupposing the position and shape of the slope sliding surface. The dynamic failure process of the whole slope can be simulated, and the safety factor and sliding surface position obtained are very close to those obtained by other methods.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.14
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，本文编号：2416109
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